The LifeStraw filter meets EPA standards and has been shown to remove more than 99.9% of waterborne parasites and bacteria. Humanitarian relief workers in all corners of the globe use the LifeStraw to help bring safe water to threatened communities and refugee camps. The “straw” itself weighs a scant 0.1 pounds and measures 9” in length and 1” in diameter. Few things are worse than being lost and being besieged by waterborne illness. Bring this essential piece of survival gear with you whenever you venture into the wild and make sure water problems are not on the menu.
To me, the best option is to store emergency food. How much? If you have none, store enough for a few days. If you have enough for a few days, get enough for a week. How much you store depends on what time frame you think you're at risk for having to be completely independent. The early settlers of the southwest liked to store enough food for a whole year and still do to this day!